I’m not sure what Hillary ever was to Bill but I’m pretty sure that Bill was never more than a means to an end for Hillary.
Hillary was a means to an end for Bill as well. They are fellow travelers, gypsies by ancestry. Hill followed Bill around during his escapades and provided the means for him to extricate himself from a variety of tangled webs. She became his indispensable fixer. She gave him the freedom to engage in behavior that would have grounded a less enabled man.
Hillary’s bid for the presidency is payback. She is not satisfied to perch on her billions and luxuriate. She wants the world and by God she will have it, Trump be damned.